i used my own track (Disquiet0215) as the source material

in ableton live track 1 Helm played live track 2 Disquiet0215 track 3 Disquiet0215 with delay track 4 armed to record

done in one take :)

track 4 was exported to audacity where the .wav was trimmed a general compressor was applied

ambient synth Helm synth by Matt Tytel http://tytel.org/helm/